bossjimmyhoffa? wewant to welcome our viewers in the united states and around the world. i'm wolf blitzer. you're in "the situation room." >>> a truly extraordinary moment at the united nations today. israeli's prime minister benjamin netanyahu on the world stage literally drawing a red line he warns iran cannot cross in its development of nuclear weapons. cnn's foreign affairs correspondent jill dougherty is in new york joining us now with the dramatic details. jill. >> reporter: right, wolf. red lines don't lead to war. red lines prevent wars. at least that's what the prime minister thinks. in a dramatic speech to the u.n. general assembly israeli prime minister benjamin netanyahu pulled out a chart showing a bomb then drew a red line near the top. >> a red line should be drawn right here. before iran completes the second stage of nuclear enrichment necessary to make a bomb. before iran gets to a point where it's a few months away or a few weeks away from amassing enough enriched uranium to make a nuclear weapon. >> reporter: it was a simplistic but chilling illustration of when